121+123+127+129+131+133+137= (121+129)+(123+137)+(127+133)
= 150 + 160 + 160
= 470
Chúc bạn học tốt
121 + 123 + 127 + 129 + 131 + 133 + 137
= ( 131 + 129 ) + ( 127 + 133 ) + ( 123 + 137 ) +121
= 260 + 260 + 260 + 121
= 260 x 3 + 121
= 780 + 121
= 901
bằng 901 nha
121 + 123 + 127 + 129 + 131 + 133 + 137
= (131 + 129) + (133 + 127) + (137 + 123) + 121
= 260 + 260 + 260 + 121
= 780 + 121
= 901
#Học tốt!!!
~NTTH~
bbrgy5tgre45ret
121+123+127+129+131+133+137
=(121+129)+(123+137)+(127+133)+131
=250+260+260+131
=510+260+131=770+131=901
=(131+129)+(133+127)+(137+123)+121
=260+260+260+121
=780+121
=901
121+ 123+127+129+131+133+137
=121+(123+127)+(129+131)+(133+137)
=121+250+260+270
=371+530
=901